A Method to Design Pumping Pipeline Considering Water Column Separation Phenomenon

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  • 水柱分離を考慮したポンプ送水系パイプラインの設計手法
  • スイチュウ ブンリ オ コウリョ シタ ポンプ ソウスイケイ パイプライン ノ セッケイ シュホウ

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Abstract

In the conventional pipeline design, it is supposed that measures which prevent the occurrence of water column separations must be taken, and that the low pressure below the saturation pressure of water vapor must not occur over the whole region of the pipeline. If the occurrence point of water column separations and its influence on the pipeline can be accurately estimated, we can adopt the optimal design, which may permit the occurrence of water column separations, for each pipeline. For appropriate estimation of pressure change causing water column separations, the authors propose air cavity model. Air cavity model can deal with change of elastic wave velocity at the point of water column separation sing predicable parameters. As a result of the waterhammer analysis on a l000m-long pumping pipeline by the characteristic method with air cavity model, it is clarified that water column separation may not necessarily cause high pressure that damages a pipeline system without any waterhammer prevention device.

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